JPS61176828A - Temperature fuse sensor for high temperature - Google Patents

Abstract

PURPOSE:To obtain a temp. fuse sensor which prevents circuit reclosing even if a melt scatters by inserting a piece of meltable metallic body into the two hole part of a heat-resistant metallic pipe constituted by adhering the heat-resistant metallic pipe and heat-resistant 2-hole insulating pipe and coating a flux to the top end thereof thereby forming the fuse sensor having the electrically closed circuit construction. CONSTITUTION:The heat-resistant metallic pipe 2 and the heat-resistant 2-hole insulating pipe 4 are adhered in a weld zone of the meltable metallic body 6 at the m.p. thereof or above and the meltable metallic body 6 is inserted into the two-hole pipe 2. The end face of the non-heating part is fixed by glass beads 8. The flux 10 is disposed to the top end of the heating part of the meltable metallic body and the heat- resistant metallic pipe 2 is inserted through the opening end of the heat-resistant metallic pipe 1. The cap 1 and the pipe 2 are hermetically fixed by welding 9a. The heat-resistant metallic pipe 3 is welded to the other end of the pipe 2 and is thereafter sealed by a heat-resistant sealant 5 to assure the hermetic characteristic. The melt aggrgates gradually in the two-hole pipe when the temp. of the meltable metallic body rises to the m.p. or above. The is not possibility of the electrical contact of said body with others and circuit reclosing even under oscillation and impact.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high-temperature temperature fuse sensor used for detecting abnormal high temperatures of 800°C or more in automobile exhaust gas purification devices used in shock and vibration environments. be.

2. Description of the Related Art Conventionally, this type of high-temperature fuse sensor has a structure as shown in FIG. That is, two heat-resistant metal wires 7a and 7b as lead wires and an insulator 3 are placed inside the heat-resistant metal tube 2.
The fusible metal body 4 is connected to the tip of the heat-resistant metal wire 7b protruding from the heat-resistant metal pipe 2 arranged with a
Heat-resistant metal wire 7! Connect the tip of L via heat-resistant metal 8,
Four fusible metal bodies are inserted into the opening of the heat-resistant cap 1, and the heat-resistant metal cap 1 and the heat-resistant metal tube 2 are sealed and fixed by welding 6. Further, the other end of the heat-resistant metal tube 2 was configured to be sealed with a heat-resistant sealing material 6.

Problems to be Solved by the Invention In such a conventional configuration, when the temperature of a high-temperature fuse sensor rises above the melting point of the fusible metal body, the molten body scatters under strong vibration shock and becomes a spherical body. Book heat-resistant metal wire 7
When placed between 0 and 0, an electrically open circuit due to melting of the fusible metal body becomes a closed circuit again and loses its function as a temperature fuse sensor. Furthermore, since the fusible metal body is welded, oxidation during welding becomes a problem, and the structure of the fusible metal body 4 may change. The present invention solves these problems by preventing the circuit from becoming a reclosed circuit even if the temperature rises above the melting point of the fusible metal body and the molten metal scatters, and by preventing the circuit from becoming a reclosed circuit during welding. This is an attempt to solve the problem of tissue fluctuation of soluble materials.

Means for Solving the Problem In order to solve this problem, the present invention uses a fusible metal body itself to create a closed circuit by passing it through two holes in a heat-resistant metal tube made by bonding a heat-resistant metal and a heat-resistant two-hole insulating tube. Insert the heat-resistant metal tube so that the tip of the heat-resistant metal tube touches the heat-resistant metal cap, weld and fix the heat-resistant metal tube and heat-resistant metal cap, and fix the fusible metal body to the heat-resistant metal tube with a glass bead at the other end to create a heat-resistant seal. It is sealed with wood.

Effect This configuration increases the temperature of the temperature fuse sensor,
When the temperature rises above the melting point of the fusible metal body, the fusible metal body melts and aggregates toward the inside of the two-hole insulating tube due to surface tension.
Even if the molten material is scattered under strong vibrations or shocks, it will not become an electrically reclosed circuit. Furthermore, since the heat-resistant metal tube and the heat-resistant two-hole insulating tube are bonded together, no stress is applied to the fusible metal body even under strong vibrations or shocks. Moreover, since there is no welding of fusible metal bodies, there is no need to worry about the structure changing.

Embodiment FIG. 1 is a sectional view of a high temperature temperature fuse sensor according to an embodiment of the present invention. In FIG. 1, a heat-resistant metal tube 2 and a heat-resistant two-hole insulating tube 4 are bonded together at a welded portion at a temperature higher than the melting point of the fusible metal body 6. The fusible metal body 6 is fixed to the end face of the heating part with glass beads 8. In this state, flux 10 is placed at the tip of the heating part of the fusible metal body, heat resistant metal tube 2 is inserted from the open end of heat resistant metal cap 1, and heat resistant metal cap 1 and heat resistant metal tube 2 are sealed by welding 9&. Fix it. Moreover, the other end of the heat-resistant metal pipe 2 is welded with a heat-resistant metal pipe 3 (9 bl).

After that, a heat-resistant sealing material 6 is applied to the inside of the metal pipe 3 to ensure hermeticity.

Effects of the Invention As described above, according to the present invention, an electrical closed circuit is created using the fusible metal body as it is, so the structure of the fusible metal body is only welded, resulting in a very simple structure. When the temperature of the metal body rises above its melting point, the molten body condenses into two large tubes and vibrates.

Even under shock, there is no need to worry about electrical contact with others and a reclosing circuit. In addition, since the insulating tube is integrally bonded to the metal, there is no possibility of failure due to displacement of the insulating tube even if there is vibration or impact before the fusible gold ingot is melted, making it possible to create a simple and highly reliable high temperature thermal storage i-use. Can be configured.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a high temperature temperature fuse sensor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional high temperature temperature fuse sensor. 1... Heat-resistant metal cap, 2... Heat-resistant metal pipe, 3... Heat-resistant metal pipe, 4...
・Heat-resistant 2-hole insulation tube, 6...Heat-resistant sealing material, 6.
... Fusible metal body, 7 ... Adhesive part, 8 ...
...Heat-resistant glass beads, 9...Welded parts, 1
0...Flux. Name of agent: Patent attorney Toshio Nakao and 1 other person5-
11-proof sealing material 9-11 Minato! ! Part to---7 Lux Figure 2

Claims (1)

[Claims] A heat-resistant metal tube and a heat-resistant two-hole insulation tube are glued together. A fusible metal body is passed through the two holes of the heat-resistant metal tube, and flux is applied to the tip, creating an electrically closed circuit structure. A thermal fuse sensor for high temperatures.